I think Diaz has a great chance in this fight. He is a smarter fighter than people give him credit for. He isn't going to go for a one punch KO like others have tried, he will methodically wear you down with shots.
As for the GSP/Fitch fight, that was almost 3 years ago. We have seen nothing in GSP's game like that anymore. He fights not to lose, that belt means more to him than it did to Big Tim! His coaches are the same way, in the Hardy fight he was told not to pass the guard until there was less than 30 seconds left in the round.
I want to see this fight happen and I think it will be a better fight than most predict.